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參數(shù)資料
| 型號： | AD9116-DPG2-EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 42/52頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC DUAL 12BIT LO PWR 40LFCSP |
| 標準包裝： | 1 |
| 系列： | TxDAC® |
| DAC 的數(shù)量： | 2 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 125M |
| 數(shù)據(jù)接口： | 串行 |
| DAC 型： | 電流 |
| 工作溫度： | -40°C ~ 85°C |
| 已供物品： | 板 |
| 已用 IC / 零件： | AD9116 |
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Data Sheet
AD9114/AD9115/AD9116/AD9117
Rev. C | Page 47 of 52
APPLICATIONS INFORMATION
OUTPUT CONFIGURATIONS
The following sections illustrate some typical output configu-
rations for the AD9114/AD9115/AD9116/AD9117. Unless
otherwise noted, it is assumed that IxOUTFS is set to a nominal
20 mA. For applications requiring the optimum dynamic
performance, a differential output configuration is suggested.
A differential output configuration can consist of either an RF
transformer or a differential op amp configuration. The trans-
former configuration provides the optimum high frequency
performance and is recommended for any application that
allows ac coupling. The differential op amp configuration is
suitable for applications requiring dc coupling, signal gain,
and/or a low output impedance.
A single-ended output is suitable for applications in which low
cost and low power consumption are primary concerns.
DIFFERENTIAL COUPLING USING A TRANSFORMER
An RF transformer can be used to perform a differential-to-
single-ended signal conversion, as shown in Figure 102. The
distortion performance of a transformer typically exceeds
that available from standard op amps, particularly at higher
frequencies. Transformer coupling provides excellent rejection
of common-mode distortion (that is, even-order harmonics)
over a wide frequency range. It also provides electrical isolation
and can deliver voltage gain without adding noise. Transformers
with different impedance ratios can also be used for impedance
matching purposes. The main disadvantages of transformer
coupling are low frequency roll-off, lack of power gain, and
high output impedance.
AD9114/AD9115/
AD9116/AD9117
IOUTN
IOUTP
29
28
OPTIONAL RDIFF
RLOAD
07466-
063
Figure 102. Differential Output Using a Transformer
The center tap on the primary side of the transformer must be
connected to a voltage that keeps the voltages on IOUTP and
IOUTN within the output common-mode voltage range of the
device. Note that the dc component of the DAC output current
is equal to IIOUTFS and flows out of both IOUTP and IOUTN.
The center tap of the transformer should provide a path for this
dc current. In most applications, AGND provides the most
convenient voltage for the transformer center tap. The comple-
mentary voltages appearing at IOUTP and IOUTN (that is,
VIOUTP and VIOUTN) swing symmetrically around AGND and
should be maintained with the specified output compliance
range of the AD9114/AD9115/AD9116/AD9117.
A differential resistor, RDIFF, can be inserted in applications in
which the output of the transformer is connected to the load,
RLOAD, via a passive reconstruction filter or cable. RDIFF, as
reflected by the transformer, is chosen to provide a source
termination that results in a low voltage standing wave ratio
(VSWR). Note that approximately half the signal power is
dissipated across RDIFF.
SINGLE-ENDED BUFFERED OUTPUT USING
AN OP AMP
An op amp, such as the ADA4899-1, can be used to perform a single-
ended current-to-voltage conversion, as shown in Figure 103.
Figure 103 is a simplified schematic. The REFIO pin must be
buffered to keep the load current less than 100 nA. The AD9114/
AD9115/AD9116/AD9117 are configured with a pair of series
resistors, RS, off each output. For best distortion performance, RS
should be set to 0 Ω. The feedback resistor, RFB, determines the
peak-to-peak signal swing by the formula
VOUT = RFB × IFS
The common-mode voltage of the output is determined by the
formula
2
1
FS
FB
B
FB
REF
CM
I
R
V
×
+
×
=
The maximum and minimum voltages out of the amplifier are,
respectively,
+
×
=
B
FB
REF
MAX
R
V
1
VMIN = VMAX IFS × RFB
+5V
AD9114/AD9115/
AD9116/AD9117
IOUTP
IOUTN 29
RFB
VOUT
REFIO 34
28
RS
AVSS 25
CF
C
RS
RB
+
–
ADA4899-1
–5V
07466-
064
Figure 103. Single-Supply, Single-Ended Buffer
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD9116-EBZ | 制造商:Analog Devices 功能描述:DUAL 12 BIT LOW POWER CONVERTER - Boxed Product (Development Kits) |
| AD9117 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual, 8-/10-/12-/14-Bit Low Power Digital-to-Analog Converters |
| AD9117BCPZ | 功能描述:IC DAC DUAL 14BIT LO PWR 40LFCSP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉換器 系列:TxDAC® 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 設置時間:4µs 位數(shù):12 數(shù)據(jù)接口:串行 轉換器數(shù)目:2 電壓電源:單電源 功率耗散（最大）:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:8-uMAX 包裝:管件 輸出數(shù)目和類型:2 電壓，單極 采樣率（每秒）:* 產(chǎn)品目錄頁面:1398 (CN2011-ZH PDF) |
| AD9117BCPZN | 功能描述:數(shù)模轉換器- DAC Dual 14B Low Power D-A Converter RoHS:否 制造商:Texas Instruments 轉換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| AD9117BCPZNRL7 | 功能描述:數(shù)模轉換器- DAC Dual Low Pwr 14-Bit RoHS:否 制造商:Analog Devices 轉換器數(shù)量:4 DAC 輸出端數(shù)量:4 轉換速率: 分辨率:12 bit 接口類型:Serial (I2C) 穩(wěn)定時間: 最大工作溫度:+ 105 C 安裝風格: 封裝 / 箱體:TSSOP 封裝:Reel |
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